In order to make more effective control of universal power quality controllers (UPQC), an outer loop model for the voltage loop in a three-phase three-wire UPQC is proposed in the paper.
为了对通用电能质量控制器直流侧电压进行更为有效的控制，提出一种用于三相三线通用电能质量控制器(UPQC)直流侧电压控制的外环模型。
A DC voltage outer loop control for power balance and PI correction and an ac current inner loop control for feedback are designed to ensure the current quality and stabilize the DC voltage.
通过直流电压外环的功率平衡控制及比例积分校正，配合内环并网电流反馈控制，使并网逆变器在保持并网电流质量的同时更好地控制直流电压。
For digitized AC servo system, it needs software to support it's closed-loop control. Its control quality is decided by the program of control computation directly.
数字化的交流伺服系统是靠软件完成控制计算来支持闭环控制的，它的控制计算程序直接决定了系统的控制质量。
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